A set of SANWA BL-RACER ESC, RX-231 receiver, and SX-107Z servo. - Brand: SANWA - Model: BL-RACER - Model: RX-231 - Model: SX-107Z These were used at the time, and the frequency of use was probably moderate. I don't have a transmitter now, so I can't confirm that they work, but when I connect a battery, the LED on the amplifier lights up red once. This is a used item, so it is only for those who understand. No returns or exchanges. Type...Radio Control